Abstract
d- and l-Carbocyclic 4′-fluoro-2′,3′-dideoxynucleosides have been synthesized from 2, which can be conveniently prepared from 1,2:5,6-di-O-isopropylidene-d-mannitol 1 in eight steps. Ruthenium-catalyzed ring-closing metathesis has been employed in the synthesis of d-nucleosides, whereas the l-series have been obtained through an intramolecular nucleophilic substitution reaction. The Mitsunobu condensation was used as a general tool for the synthesis of both purine and pyrimidine nucleosides.
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